Is South Sioux City, Nebraska tap water safe?
2 water systems report serving South Sioux City. Your water depends on which one serves your address. Check your bill if unsure.
A
City of South Sioux City
Serves 14,043 people · Surface water · Full report →
No health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
A
Crystal Lake MHP, LLC
Serves 100 people · Groundwater · Full report →
No health-based violations in the last 5 years; No UCMR 5 PFAS results on file; Latest lead 90th percentile on file is from 2004 (older than 5 years, not graded).